Vacuum breaker



May 23, 1939 w. E. sLoAN 2,159,056

VACUUM BREAKEH Filed July 14, 19:54

zy/ @y2 27 33 Hi" 22 3d 26 25 344 34 29 *Y za 36 #e Hi!" .35/ 25213 22 36A 2z 1 l 2/ l I 2/ 20 l I 11 /2 /9 /6 2 /7 /f if' 5 '41a l g 6 H 13 32 3/ 33 34\( ai? 2.9\n za 3.5/ 2.9 24 .36' 23 ffzUe/or Zf//ZcU//z A51/0a?? Patented May 23, y1939 UNITED STATES PATENT OFFICE VACUUM William E. Sloan, Chicago, lll., assigner to Sloan Valve Company, Illinois 0. Ill., a corporation d I'his invention relates to vacuum breakers and has for its object to provide a new and improved device of this description. The invention has as a further object to provide a vacuum breaker which positively prevents back syphonage from xtures with submerged inlets or hose sprays when installed on the discharge side oi' the control valves and above the spill line of the ilxture. 'I'he invention has as a further object to provide l0 a vacuum breaker particularly adapted for hospital use. The invention has other objejcts which are more particularly `pointed out in the accompanying description.

Referring now to the drawing, Fig. l is a view showing one iorm of vacuum breaker;

Fig. 2 is a longitudinal sectional view therethrough;

Fig. 3 is a sectional view taken on line 2-2 of Fig. 2. Like numerals refer to like parts throughout the several figures.

Referring now to the drawing, there is shown a vacuum breaker comprising a casing I having an inlet 2 and an outlet I. The outlet 8 is provided with a discharge pipe I which may discharge liquid into a nxture having a submerged inlet, although it may be used ln other connections iidesired.

Within the easing is a valve seat 6 surrounding so an opening 6 which connects the inlet 2 andthe outlet 3. A valve 1 is located in the casing and is adapted to engage the valve seat l, as shown on the side thereof next the outlet I. The valve is preferably provided with a seating face 8 ci 35 non-metallic material which insures a proper and complete seating at all times. When in use, this valve 1 is arranged in any desired position. A valve stem 9 is connected with the valve i and extends in a direction substantially parallel 40 with the axis oi the inlet 2. A guiding member II extends across the valve casing and is provided with an opening into which the valve stem 9 is received. The guiding member II is preferably provided with a hub I2 to secure a com- 45 paratively large contact area with the valve stem.

The valve stem, as herein shown, projects through the valve 1 and is provided with a screw threaded portion Il upon which is received a 50 nut Il by means of which the valve is tightly held in position on the valve stem by being forced against the shoulder Il. A coil spring II surrounds thls end oi' the valve stem. The valve is provided with a projection I1 which Proiects into thecoilspring,asshownin1lig.2.

A plug Il is screw threaded in an opening in the valve casing and is recessed to receive the end of the spring IC. Extending across the valve casing is a wall I9 provided with an opening 20. Extending on one side o! the wall I0 is a nipple s or hollow tubular member 2I having an internal screw thread. Screw threaded into this tubular member is a member 22 having the hollow portion 2l and the solid portion 2l. 'Ihe solid portion is provided with the two eways 25 and 10 2O which connect with the hollow portion 23 and with the recess 21 at the top oi the member 22. The solid portion 2i is provided with the central passageway 2l which is connected by a cross passageway 20 with the exterior oi the member 22. 16 Within the passageway 28 loosely lits the noncircular stem 3B of the valve member Il which rests loosely on the seat 32. Connected with the top of the member 22 is a cap 32 which has a projecting ange member Il which projects 20 acl-om the open ends of the passageway 29, there being a space 25 between the flange ll and the outer tace of the member 22. The member 22 has beyond the end o! the ange Il an outwardly extending annulus 2i.

I have described in detail a particular construction embodying the invention, but it is Ioi' course evident the parts may be varied in many particulars without departing from the spirit of the invention as embodied in the claims hereto ap- 30 pended, and I therefore do not limit myself to the particular construction shown.

The use and'operation o! my invention are as follows:

In the use of the device, theinlet pipe is connected with the inlet 2 and the discharge pipe with the outlet 2. When the valve is in operation. the water enters the inlet 2 and moves and opens the valve 1 so as to be discharged from the outlet i. Any water that may pass through the 40 opening 2l e up through the passageways I2 and 3l to the recess 21 and to the top oi the valve member Il so as to move it to its closed position and prevent the escape of the water. It there is a back pressure or syphonage action, tending to draw the polluted water up through the outlet 3 and into the supply pipe. this syphoning action draws air from outside o! the member 22 into the space Il and then into the passageway 20 and up through the passageway 28. lifting the valve member `II and passing said valve member, and then passing down through the passageways 2l and 2t into the chamber 2l and then through theopening2landthenthroughthecasingand throughtheoutlot therebybreakingthevacu 2 alcance uum and preventing the suction action. It will therefore be seen that there is here provided a vacuum breaker which insures the breaking of the vacuum so asto prevent back syphonage and which at the same time prevents the water from passing out o! the device so as to be discharged therefrom. When the valve 1 is working proper- 1y, it prevents back syphonage. Ii' it fails to work properly, as by becoming worn, or when it is prevented !rom properly seating or closing, or for other reasons, the vacuum is broken by the construction as above described. It will be seen that this construction gives double protection.

I claim:

l. A vacuum breaker for xtures having submerged inlets comprising a casing having an inlet and an outlet. a valve seat intermediate the inlet and outlet, a valve engaging said seat, a hollow tubular member connected with said casing, a member having a screw threaded connection with said hollow tubular member and having a hollow portion, a solid portion beyond said holllow portion, a recess in said member, a passageway connecting said hollow portion with said recess, a second passageway in said solid portion extending partway therethrough, a cross passageway connected with said central passageway and extending to the exterior surface of said member, a valve device in said recess having a stem pro- 30 iecting into said second passageway, the stem closed and being held closed by the pressure on the interior of the said member having a screw threaded connection with the hollow tubular member and being opened by atmospheric pressure.

2. A vacuum breaker for preventing back syphonage from xtures having submerged inlets comprising an inlet and an outlet, a valve seat intermediate the inlet and outlet, a valve engaging said seat, a hollow tubular member connected with said casing, a member having a screw threaded connection with said hollow tubular member and having a hollow portion, a solid portion beyond said hollow portion, a recess in said member, a passageway connecting said hollow portion with said recess, a second passageway in said solid portion extending partway therethrough, a cross passageway connected with said central passageway and extending to the exterior surface of said member, a valve device in said recess having a stem projecting into said second passageway, the stem being of smaller cross sectional area than the passageway, said valve device being normally closed and being held closed by the pressure on the interior of the said member having a screw threaded connection with the hollow tubular member and being opened by atmospheric pressure, and a cap for said member having a projecting ange member separated by a space from said member and projecting past the open ends oi' said cross passageway.

WILLIAM E. SLOAN.

CERTIFICATE F CORRECTION Patent No. 2,159,056.

WILLIAM E.

Mar 23 1959- sLoAN.

It isherebyr certified that. error appears in the printed specification ofthe above numbered patent requiring correction as follows: Page 2, second column, line 8, claim 2', after "comprising" insert a casing having; and that the said Letters Patent should be read with this correction therein that the same may conform to the reoordof the case in the Patent Office.

Signed and sealed this 50th day of January, A. D.4 l9li0.

(Seal) Henry Van Arsdale, Acting Commissioner of Patents.

2 alcance uum and preventing the suction action. It will therefore be seen that there is here provided a vacuum breaker which insures the breaking of the vacuum so asto prevent back syphonage and which at the same time prevents the water from passing out o! the device so as to be discharged therefrom. When the valve 1 is working proper- 1y, it prevents back syphonage. Ii' it fails to work properly, as by becoming worn, or when it is prevented !rom properly seating or closing, or for other reasons, the vacuum is broken by the construction as above described. It will be seen that this construction gives double protection.

I claim:

l. A vacuum breaker for xtures having submerged inlets comprising a casing having an inlet and an outlet. a valve seat intermediate the inlet and outlet, a valve engaging said seat, a hollow tubular member connected with said casing, a member having a screw threaded connection with said hollow tubular member and having a hollow portion, a solid portion beyond said holllow portion, a recess in said member, a passageway connecting said hollow portion with said recess, a second passageway in said solid portion extending partway therethrough, a cross passageway connected with said central passageway and extending to the exterior surface of said member, a valve device in said recess having a stem pro- 30 iecting into said second passageway, the stem closed and being held closed by the pressure on the interior of the said member having a screw threaded connection with the hollow tubular member and being opened by atmospheric pressure.

2. A vacuum breaker for preventing back syphonage from xtures having submerged inlets comprising an inlet and an outlet, a valve seat intermediate the inlet and outlet, a valve engaging said seat, a hollow tubular member connected with said casing, a member having a screw threaded connection with said hollow tubular member and having a hollow portion, a solid portion beyond said hollow portion, a recess in said member, a passageway connecting said hollow portion with said recess, a second passageway in said solid portion extending partway therethrough, a cross passageway connected with said central passageway and extending to the exterior surface of said member, a valve device in said recess having a stem projecting into said second passageway, the stem being of smaller cross sectional area than the passageway, said valve device being normally closed and being held closed by the pressure on the interior of the said member having a screw threaded connection with the hollow tubular member and being opened by atmospheric pressure, and a cap for said member having a projecting ange member separated by a space from said member and projecting past the open ends oi' said cross passageway.

WILLIAM E. SLOAN.

CERTIFICATE F CORRECTION Patent No. 2,159,056.

WILLIAM E.

Mar 23 1959- sLoAN.

It isherebyr certified that. error appears in the printed specification ofthe above numbered patent requiring correction as follows: Page 2, second column, line 8, claim 2', after "comprising" insert a casing having; and that the said Letters Patent should be read with this correction therein that the same may conform to the reoordof the case in the Patent Office.

Signed and sealed this 50th day of January, A. D.4 l9li0.

(Seal) Henry Van Arsdale, Acting Commissioner of Patents. 

